Educational appliance



Aprl 21, 192s. A 1,535,056

W. STLOFF EDUCATIONAL APPLIANCE Filed 001'.. 22, 1923 Figa.

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will* Patented pr. 21, 1925'.

UNITED STATES WOLF STOLOFF, F LONDON, ENGLAND.

EDUCATIONAL APPLIANOE.

Application filed October 22, 1923. Serial No. 670,085.

To all whom t may concern.'

Be it known that I, WOLF S'roLoFF, a subject of the King of Great Britain, residing at London, England, have invented a new and useful Improvement in Educational Appliances, of which the lfollowing is a specification.

This invention relates to educational appliances constructed as cabinets or frames l0 With an opening provided with one or more shutters or blinds permitting different parts of a line of characters, or of a picture or the like to be exhibited or concealed, as desired.

In the improved educational appliance according to this invention, the shutters o1' blinds are made of an accordion pleated fabric arranged so that the pleats or folds of;

the fabric open out to allow the shutter oi blind to be expanded or drawn over a part Within the cabinet or frame which it is desired to conceal, or to fold closely together and thus entirely uncover the opening, permitting a character, inscription, picture or the like to be exhibited in its entirety With` in the opening or slot in the cabinet or frame.

In the accompanying drawing:

Figure l is a front view and Figure 2 is a plan of a cabinet or frame having an opening in the front thereof, and

provided with shutters or blinds, in accordance with this invention, arranged to cover or uncover the said opening.

Figure 3 shows a vertical section of the cabinet or yframe on the line X-X, Fig

ure 2.

As shown in the dra-Wing, a is a cab-inet or frame having rollers b mounted therein and rotatable by handles c so that a sheet d can be moved behind an opening e in the front Wall of the cabinet or frame, in order to successively exhibit different parts of the sheet.

The opening e can be screened or covered Wholly or in part by shutters or blinds made of pleated fabric 7'", such as canvas coated with a stiffening or other suitable material, or thej7 may be made of slats or strips of relatively still material joined together by strips of more flexible material, or of a relatively stiff material having' its stiffness broken down along the lines of the folds.

One edge or end of each shutter or blind f is secured. to the Wall of the cabinet or frame by a batten g and the opposite edge or end is securedto 'a stiifening bar or plate It provided With a handle i. The bars h are slidably mounted in guide grooves j, which also serve to guide the unattached edges of the shutters or blinds, and these bars are provided with springs 7c serving as brakes to hold each bar in any position to Which it may be moved so that, for example, the blind is not drawn up or Withdrawn from screening the opening e' by the tendency of the pleated material to assume its folded condition.

lVith this arrangement, the shutters or blinds can be extended to entirely cover or screen the opening e or they can be adjusted to expose only a part of the sheet d.

What I claim is:

l. An educational appliance comprising a frame having guideWays, a shutter made of pleated fabric coated with a stiflening materia-l and having the stiffness broken down along the lines of the folds, said shutter having a pair of opposite edges movable in said guideivays and having one of its other edges secured to said frame, and a bar to which the edge of the shutter opposite to that secured to the frame is secured.

2. An educational appliance comprising a frame having guideways, a shutter made of strips of relatively stiff material joined together by strips of more flexible material, means .for securing one edge of the shutter to the frame, a bar to Which the opposite edge of the shutter is secured and movable in said guideWa-ys, and a spring brake associated With said bar and said frame to hold the bar in any position to Which it may be moved in the said guideways.

W. STOLOFF. 

